Receiver.



0. IVI. LEICH.

RECEIVER.

APPLICATION FILED MMI. so. 1914. Y

Patented 00h12, 1915.

COL MEM 4PLAPIIOCIFLAPH U., WASHINGTON. D. C.

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OSCAR IVI. LEICH, or GENOA, ILLINOIS, AssIGNoR To ORAOEAET, LEIoH ELECTRIC COMPANY, OF GENOA, ILLINOIS.

'n RECEIVER.

Application led March 30, 1914. Serial No. 828,199.

To all whom t may concern.' Y

Be it known Vthat I, OSCAR M. LEIOH, a citizen of the United States, residing at Genoa, in the county of Dekalb and State oi' Illinois, have invented a certain new and useful Improvement in Receivers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates tol receivers and more particularly to that class of telephone receivers known at the present timein the art as direct current receivers, by which is meant those receivers not employing a permanent magnet. 1n accordance with my invention I simplify the construction of receivers of this class, and also provide a structure conducive to greater eiiiciency.

The features of my invention are concerned primarily with the construction and arrangement of the so-called cup portion of the receiver and also the coil and spool arrangements.

n accordance with my inventionl construct the so-called cup of the receiver of magnetic material, thus to form part of the magnetic circuit which includes the diaphragm by reason of whichI am enabled to secure more effective articulation.

T will explain my invention more in detail by referring to the accompanying drawing illustrating one form of carrying out my invention, in which- Figure 1 is a partial longitudinal sectional view of a receiver constructed in accordance with my invention; Fig. 2 is a side View at right angles to that of Fig. 1 with the shell in section; Fig. 3 is a view looking toward the cup of the receiver with the cap and diaphragm removed, and Fig. 4; is a sectional view on line c a of Fig. 1.

My improved receiver has the customary shell 1 and cap 2. The shell and cap between them support the parts of the receiver, as the shell and cap have screw threaded engagement with each other and thus are enabled to clamp between them the cup 3 and diaphragm a. The cup 3 is made of magnetic material and has riveted to it a pole piece 5 as shown more clearly in Fig. 1. The cup also has riveted to it two extending arms, 6, G respectively, which arms carry a weight consisting of the two sections 7, 7. This weight is held in place by means of the Specification. of Letters Patent.

retenant oet. I2, 1915.

bolt 8. The weight 7 while it appears to take the form of a permanent magnet, does not perform the purposes of a permanent magnet, but merely serves to give the required weight necessary so that the receiver may adequately actuate the switchhook. The arms 6, 6 are united by the bridge piece 9 so that the arms 6 and bridge piece 9are constructed of one apparent from Fig. 2. The bridge portion 9 through the agency of the screw 10 carriesv an insulating plate 11. This insulating plate 11 through the agency of the screws 12, 12 carries connecting terminals 13, 13 adapted to receive the connecting ends of the cords le, 14;. The screws 12 are of course countersunk Vin the plate 11 so they do not touch the metallic bridge piece 9. lTwo connecting bars 15, 15 are held in place by the screws 12 so that they are in electrical contact with the lbinding posts 13, 13. These conducting bars 15 extend through holes 16, 16 provided in the cup 3, which holes are properly bushed by insulating material as is readily apparent from Fig'. 1. These conducting bars 15 alsofextend through holes provided in a portion of the spool structure as will be apparent later, which spool structure is carried by the pole piece 5, and which spool structure carries the coil 17 whose terminals are electrically connected with the conduct-k ing bars 15, 15.

This spool structure is made entirely of insulating material and consists of the cylindrical element 18 fastened to an end plate 19 and an end plate 20 of larger diameter. These three plates are securely fastened together to provide a hollow core and support for the coil 17. An insulating distance piece or washer 21 is interposed between the spool and the cup 3. Thespool structure is provided with holes 22, 22, to accommodate the piece, as will be readily conducting bars 15. The spool structure in its entirety is removable as is readily apparent from Fig.,1, and is normally held in place by screws 23, 23.

From what has been described my improved structure will be readily apparent to those skilled in the art. It is also apparent that I am not restricted to the specific details, but that my invention is capable of va` riation from the structure herein disclosed, without departing from the spirit of myv in-v vention. y

Having however thus described one form what claim which my invention may take,

Letters Patas new and desire to secure by ent is:

1. A telephone receiverl having a diaphragm, an actuating coil, a cup of magnetic material within which said coil is mounted and engaging at its periphery with said diaphragm, a bridge secured rearwardly of said cup, connecting terminals Vcarried by said bridge, a weight forming no part of the magnetic circuit carried by said bridge, and conducting bars extending from said Connecting terminals to within the cup.

2. A telephone receiver having a diaphragm, a cup of magnetic material associated at its periphery with said diaphragm,

Copies of this patent may be obtained for a magnetic pole piece secured to said cup, a removable spool mounted on said pole piece, a coil carried by said spool, a bridge secured rearwardly of said cup, connecting terminals carried by said bridge, a weight forming no part of the magnetic circuit carried by said bridge, and conducting bars extending from said connecting terminals to witl in the cup.

ln witness whereof, I hereunto subscribe my name this 24th day of March, A. D.,

OSCAR M. LEICH.

lVitnesses HAZEL ANN JONES, A. LYDA JONES.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

